Wheel exercising device

Abstract

A wheel exercising device includes a shank, two handgrips, two wheels, and two caps. The shank has a first threaded section and a second threaded section having different screwing directions. Each of the two handgrips is formed with an internal threaded section screwed onto the first threaded section and the second threaded section of the shank. At least one elastic member is connected between the two handgrips. Each of the two wheels is mounted on the shank. Each of the two caps is mounted on the shank and rests on one of the two wheels. When the two wheels are rotated forward and backward, the two handgrips are moved inward and outward synchronously along the first threaded section and the second threaded section of the shank.

The invention claimed is: 
     
       1. A wheel exercising device comprising:
 a shank; 
 two handgrips mounted on the shank; 
 two wheels mounted on the shank; and 
 two caps mounted on the shank and resting on the two wheels; 
 wherein: 
 the shank has a surface formed with a first threaded section and a second threaded section having a screwing direction opposite to that of the first threaded section; 
 the shank is provided with a stop portion located between the first threaded section and the second threaded section; 
 the shank has two ends each provided with a connecting portion; 
 each of the two handgrips is formed with a through hole mounted on the first threaded section and the second threaded section of the shank; 
 the through hole of each of the two handgrips has a peripheral wall formed with an internal threaded section screwed onto the first threaded section and the second threaded section of the shank; 
 each of the two handgrips is formed with a connecting ring directed toward the stop portion of the shank; 
 at least one elastic member is connected between the connecting rings of the two handgrips; 
 each of the two wheels has a center provided with an axial hole mounted on the respective connecting portion of the shank; 
 each of the two caps is mounted on the respective connecting portion of the shank and rests on one of the two wheels; 
 when the two wheels are rotated forward and backward, the two handgrips are moved inward and outward synchronously along the first threaded section and the second threaded section of the shank, and the at least one elastic member provides a pulling force between the two handgrips to pull the two handgrips toward the stop portion of the shank. 
 
     
     
       2. The wheel exercising device of  claim 1 , wherein each of the two caps is provided with two apertures, and the respective connecting portion of the shank has an interior provided with a substantially U-shaped elastic plate which has two ends each provided with a boss which protrudes from the respective connecting portion and is inserted into each of the two apertures to form a quick release structure between each of the two wheels and the shank. 
     
     
       3. The wheel exercising device of  claim 1 , further comprising:
 two bushings each mounted between the respective connecting portion of the shank and the axial hole of one of the two wheels. 
 
     
     
       4. The wheel exercising device of  claim 1 , wherein each of the two wheels is formed with a plurality of spokes extending outward from the axial hole in a radiating manner, and each of the two caps is formed with a plurality of retaining grooves directed toward and mounted on the spokes of one of the two wheels, so that the two caps and the two wheels are rotated synchronously. 
     
     
       5. The wheel exercising device of  claim 1 , wherein the connecting ring of each of the two handgrips is formed with a plurality of slits arranged in a radiating manner, and each of the slits allows entrance of the at least one elastic member and has a bottom formed with a positioning hole for limiting the at least one elastic member. 
     
     
       6. The wheel exercising device of  claim 5 , wherein the at least one elastic member is an elastic loop extending through four adjacent positioning holes of the two handgrips. 
     
     
       7. The wheel exercising device of  claim 5 , wherein the at least one elastic member is a tension spring hooked between two opposite positioning holes of the two handgrips. 
     
     
       8. The wheel exercising device of  claim 5 , wherein the at least one elastic member is an elastic cord extending through all of positioning holes of the two handgrips. 
     
     
       9. The wheel exercising device of  claim 1 , wherein the connecting ring of each of the two handgrips is formed with a plurality of positioning holes for fixing the at least one elastic member. 
     
     
       10. The wheel exercising device of  claim 9 , wherein the at least one elastic member is a tension spring hooked between two opposite positioning holes of the two handgrips. 
     
     
       11. The wheel exercising device of  claim 9 , wherein the at least one elastic member is an elastic cord extending through all of positioning holes of the two handgrips. 
     
     
       12. The wheel exercising device of  claim 1 , wherein:
 the connecting ring of each of the two handgrips has a periphery formed with a plurality of locking holes; 
 the wheel exercising device further comprises two covers each locked on the connecting ring of one of the two handgrips by a plurality of screw members which are screwed into the locking holes of the connecting ring of one of the two handgrips; and 
 each of the two covers is provided with a shell extending toward the stop portion of the shank to cover the at least one elastic member.